If you have any questions, please contact us before your purchase via e-mail (sunsethydro@rochester.rr.com) or phone (1-866-395-9204). Here at Sunset Hydroponics, we specialize in hydrogardening, that is what we do, this is what we know! If you have questions, you can go to our website and look for the answer. You may also contact us directly at 1-866-395-9204, we have knowledgable answers. 
WE ARE NOW FEATURING FREE* SHIPPING ON ALL ORDERS SHIPPED TO THE CONTINENTAL US!!!!
(*Free shipping is standard ground, not express. Faster service is available)